diff options
Diffstat (limited to 'compiler/rustc_parse/src/parser/pat.rs')
| -rw-r--r-- | compiler/rustc_parse/src/parser/pat.rs | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/compiler/rustc_parse/src/parser/pat.rs b/compiler/rustc_parse/src/parser/pat.rs index b62c7373800..1da371e0b72 100644 --- a/compiler/rustc_parse/src/parser/pat.rs +++ b/compiler/rustc_parse/src/parser/pat.rs @@ -26,11 +26,18 @@ pub(super) enum GateOr { /// Whether or not to recover a `,` when parsing or-patterns. #[derive(PartialEq, Copy, Clone)] -enum RecoverComma { +pub(super) enum RecoverComma { Yes, No, } +/// Used when parsing a non-terminal (see `parse_nonterminal`) to determine if `:pat` should match +/// `top_pat` or `pat<no_top_alt>`. See issue <https://github.com/rust-lang/rust/pull/78935>. +pub enum OrPatNonterminalMode { + TopPat, + NoTopAlt, +} + impl<'a> Parser<'a> { /// Parses a pattern. /// @@ -43,13 +50,17 @@ impl<'a> Parser<'a> { /// Entry point to the main pattern parser. /// Corresponds to `top_pat` in RFC 2535 and allows or-pattern at the top level. - pub(super) fn parse_top_pat(&mut self, gate_or: GateOr) -> PResult<'a, P<Pat>> { + pub(super) fn parse_top_pat( + &mut self, + gate_or: GateOr, + rc: RecoverComma, + ) -> PResult<'a, P<Pat>> { // Allow a '|' before the pats (RFCs 1925, 2530, and 2535). let gated_leading_vert = self.eat_or_separator(None) && gate_or == GateOr::Yes; let leading_vert_span = self.prev_token.span; // Parse the possibly-or-pattern. - let pat = self.parse_pat_with_or(None, gate_or, RecoverComma::Yes)?; + let pat = self.parse_pat_with_or(None, gate_or, rc)?; // If we parsed a leading `|` which should be gated, // and no other gated or-pattern has been parsed thus far, |